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Section 5 – Biology of the Lower Olentangy River Watershed

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Section 5 – Biology of the Lower Olentangy River Watershed Friends of the Lower Olentangy Watershed March 2002 / edited 2003 5. Biology of the Lower Olentangy River Watershed The Olentangy River watershed is part of the Teays-Old Ohio Freshwater Ecoregion (Abell, Olson, Dinerstein, et al., 2000). This freshwater ecoregion is considered to be globally outstanding because of the sheer numbers of aquatic species found within it: 206 native fish species, 122 unionid mussel species, 49 species of crayfish, and 60 native species of amphibians and aquatic reptiles. The great diversity of the biotas in rivers and streams in this region is the result of the diversity of upland and lowland habitats and the presence of both glaciated and unglaciated stream systems. Twelve percent of the fish, 14% of the mussels, 47% of crayfish, and 5% of the reptiles and amphibians are restricted to this ecoregion and found nowhere else. In pre-settlement times (prior to the 19th Century), the landscape across this ecoregion was heavily forested. However, much of the area has been extensively logged, often repeatedly, since the arrival of Europeans. Row-crop agriculture is the predominant land use across the region with well over 50% of the land cover altered from its original post-glacial nature. Streams throughout the area have also been significantly altered and currently face the entire litany of threats faced by stream systems in the 21st Century. These include impoundments, point source and non-point source pollution, excessive sedimentation, nutrient enrichment, hydromodification of the original stream channel and the associated flood plain, habitat loss, and urbanization. Aquatic Biotas in the Lower Olentangy Sub-basin Ohio EPA’s Division of Surface Water and ODNR’s Division of Natural Areas and Preserves Scenic River program both regularly use aquatic biotas as indicators of water quality in Ohio streams. The focus for both agencies has been on the abundance and diversity of pollution-intolerant species relative to the abundance of pollution-tolerant species. Pollution-intolerant species are specialized forms that have a narrow range of tolerance for a specific suite of environmental parameters, including dissolved oxygen, temperature, water clarity, salinity, substrate conditions, stream depth and velocity, nutrient levels, food resources, and the presence/absence of chemical contaminants in water or sediment. These species typically cannot live in stream environments impacted by excessive nutrients, sedimentation, or the influx of pollutants. These “sentinel” species and their presence and abundance in a stream serve as an indication of good to excellent water quality conditions. Their scarcity or absence suggests the presence of negative factors – pollutants and/or physical or chemical changes to stream habitats that have adversely impacted populations of these species in the stream. Pollution- intolerant species typically have specific habitat requirements. In Ohio rivers and streams, these species are primarily riffle-dwelling species- species that require shallow, high velocity, highly oxygenated, clear water conditions over silt-free, hard substrates – features characteristic of good riffle habitat. Good quality, naturally flowing rivers and streams typically have an abundance of such riffle zone habitat and support diverse and abundant populations of pollution-intolerant aquatic species. Lower Olentangy River Watershed Inventory D-35 Friends of the Lower Olentangy Watershed March 2002 / edited 2003 Ohio EPA’s use of biological indicators to assess water quality utilizes a combination of measurements of the abundance and diversity of pollution-intolerant fish and benthic macro-invertebrates in rivers and streams. Benthic macro-invertebrates are bottom- dwelling animals that lack backbones and which are visible with the naked eye. They include animals like crayfish, mussels, snails, worms, and a variety of aquatic insect larvae. ODNR’s Scenic Rivers volunteer monitoring program focuses on riffle-dwelling benthic macro- invertebrates alone. The following describes the occurrence of both pollution intolerant fish and benthic macro-invertebrate species in the Lower Olentangy River Sub-basin and their significance with regard to what they tell us about water quality along this stretch of the river. Fish Fish have been used widely as biological indicators of stream water quality. Fish are useful as water quality indicators as: 1) they are fully aquatic throughout their life cycle; 2) different species have different tolerances to amounts and types of pollution; 3) they are relatively easy to collect; 4) they are relatively easy to identify; and 5) they are comparatively long-lived and mobile, hence are indicators of general conditions across a large area [indicators of macro- habitat quality rather than micro-habitat quality]. Their use as indicators centers on the abundance and diversity of pollution-intolerant species and also the health and appearance of individual fish. Information regarding fish species in Ohio streams and their relative tolerance of pollutants has been compiled by Ohio EPA’s Division of Surface Water (1999, Table 11). Pollution-intolerant species have been further divided into rare-intolerant species (R), special intolerant species (S), pollution-intolerant species (I), and moderately intolerant species (M). Fish are a major part of Ohio EPA’s current stream water quality evaluation process. The Division of Surface Water has developed several measures using fish biotas as water quality indicators. The Index of Biotic Integrity (IBI) measures multiple parameters – 12 “metrics” including the abundance and diversity of pollution-intolerant fish species, trophic composition (carnivores vs. insectivores vs. herbivores), plus fish biomass and physical condition (Ohio EPA, 1995). The Modified Index of Well-Being (MIwb) is also used, calculating fish biomass and density and factoring out the effects of 13 common pollution- tolerant species. Data with regard to the occurrence and abundance of pollution-intolerant fish in the Lower Olentangy River include results of fish sampling carried out by Ohio EPA along this stretch of the river in the summer of 1999 (C. Bouche, pers. comm., 2001) and historical data collected by Ohio EPA along the entire course of the river between 1979 and 1999 (D. Mishne, pers. comm., 2001). These data are presented in Table 11. Ohio EPA has collected similar data for other central Ohio streams (Big Darby Creek, the Middle Scioto River, Alum Creek, and Big Walnut Creek). A comparison of the diversity and abundance of pollution-intolerant fish species in central Ohio streams is presented in Table 12. From these data, it can be seen that pollution- intolerant species made up 40% of the total species collected from the Lower Olentangy River in 1999. These same pollution-intolerant species comprised 43% of the total number of fish collected from this stretch of the river the same year. These numbers compare Lower Olentangy River Watershed Inventory D-36 Friends of the Lower Olentangy Watershed March 2002 / edited 2003 favorably with those indicated for Big Darby Creek in Franklin County (37% and 46%, respectively). Big Darby Creek is considered by Ohio EPA, the Nature Conservancy, and others to be the highest quality stream remaining in central Ohio; supporting the highest diversities of aquatic biotas, including large numbers of pollution intolerant species often found nowhere else in the region. In terms of both pollution-sensitive fish species and pollution-intolerant individuals, the lower part of the Olentangy River ranks second among central Ohio streams behind Big Darby Creek. The presence of these species suggest good to excellent water quality conditions and the local occurrence of good riffle habitat along this portion of the Olentangy mainstem. Based on the 1999 fish survey of the Lower Olentangy River (Ohio EPA, 2001), numerically predominant species included the spotfin shiner (13.9%), golden redhorse (9.5%), smallmouth bass (8.6 %), bluntnose minnow (7.6 %), and the bluegill sunfish (7.5%). In terms of biomass, dominant species were the common carp (30.3%), golden redhorse (23%), silver redhorse (10.3 %), black redhorse (6.4 %), and quillback carpsucker (4.5 %). Data from Ohio EPA (D, Mishne, 2001) and from ODNR’s Natural Heritage database (2001) indicated the presence of four endangered, threatened, or special interest fish species in the Lower Olentangy River mainstem. These included the endangered Northern Brook Lamprey (Ichthyomyzon fossor), the endangered Spotted Darter (Etheostoma maculatum), the threatened Bluebreast Darter (E. camurum), and the state special interest River Redhorse (Moxostoma carinatum). It is of interest that all of these species occur in the heavily urbanized stretch of the river between I-270 and the confluence with the Scioto River in Franklin County as well as in more pristine stretches of the Olentangy River paralleling High Banks Metro Park (MORPC. 1997; ODNR Natural Heritage database, 2001). Data from Ohio EPA (2001) also indicate that the Olentangy River is one of the premier Smallmouth Bass streams in central Ohio (Tables 13,14). The Smallmouth Bass (Micropterus dolomieu) is one of Ohio’s most sought after sport gamefish. It is limited to clearer waters over rocky-bottomed portions of Lake Erie and to deeper pools with gravel or rock bottoms and a viable current in streams and rivers across Ohio. Smallmouth Bass in the Olentangy River comprise a larger percentage of the total number of fish collected (8.6%) compared
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